Palaechinoida

Palaechinoida

[¦pāl·ē·kī′nȯid·ē·ə]
(paleontology)
An extinct order of echinoderms in the subclass Perischoechinoidea with a rigid test in which the ambulacra bevel over the adjoining interambulacra.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.